保护环境的建议表达 — 英语词汇题
题目
完成关于保护环境的建议，每空一词：1. We should r______ paper and plastic bags instead of throwing them away. 2. Don't w______ water; remember to turn off the tap after washing hands. 3. We can p______ trees every spring to make the air cleaner. 4. It's better to walk or ride a bike to school to cut down air p______.